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Add triangular prism surface area calculation #7695

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e540c1b
Added surface area calculation for triangular prism, and fixed Illega…
JMullin-06 Oct 29, 2026
9eeabbc
Variable name error change
JMullin-06 Oct 29, 2026
4002d5a
Formatting Errors
JMullin-06 Oct 29, 2026
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28 changes: 27 additions & 1 deletion src/main/java/com/thealgorithms/maths/Area.java
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ public static double surfaceAreaSphere(final double radius) {
*/
public static double surfaceAreaPyramid(final double sideLength, final double slantHeight) {
if (sideLength <= 0) {
throw new IllegalArgumentException("");
throw new IllegalArgumentException("Side length must be greater than 0");
}
if (slantHeight <= 0) {
throw new IllegalArgumentException("slant height must be greater than 0");
Expand Down Expand Up @@ -232,4 +232,30 @@ public static double surfaceAreaCone(final double radius, final double height) {
}
return Math.PI * radius * (radius + Math.pow(height * height + radius * radius, 0.5));
}

/**
* Calculate the surface area of a triangular prism with a right-triangle base.
*
* @param sideA first perpendicular side of the triangular base
* @param sideB second perpendicular side of the triangular base
* @param prismLength length of the prism
* @return surface area of the given triangular prism
*/
public static double surfaceAreaTriangularPrism(final double sideA, final double sideB, final double prismLength) {
if (sideA <= 0) {
throw new IllegalArgumentException("Side A must be greater than 0");
}
if (sideB <= 0) {
throw new IllegalArgumentException("Side B must be greater than 0");
}
if (prismLength <= 0) {
throw new IllegalArgumentException("Prism length must be greater than 0");
}

double hypotenuse = Math.sqrt(sideA * sideA + sideB * sideB);
double totalTriangleArea = sideA * sideB;
double lateralSurfaceArea = prismLength * (sideA + sideB + hypotenuse);

return totalTriangleArea + lateralSurfaceArea;
}
}
79 changes: 41 additions & 38 deletions src/test/java/com/thealgorithms/maths/AreaTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -71,44 +71,47 @@ void surfaceAreaCone() {
assertEquals(301.59289474462014, Area.surfaceAreaCone(6, 8));
}

@Test
void testSurfaceAreaTriangularPrism() {
assertEquals(132.0, Area.surfaceAreaTriangularPrism(3, 4, 10), 1e-9);
}

@Test
void testAllIllegalInput() {
assertAll(()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCube(0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(0, 1, 2)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(1, 0, 2)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(1, 2, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaSphere(0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaRectangle(0, 10)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaRectangle(10, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCylinder(0, 1)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCylinder(1, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaSquare(0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTriangle(0, 1)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTriangle(1, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaParallelogram(0, 1)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaParallelogram(1, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(0, 1, 1)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(1, 0, 1)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(1, 1, 0)),
()
-> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCircle(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaHemisphere(0)), () -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCone(1, 0)), () -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCone(0, 1)));
assertAll(
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCube(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(0, 1, 2)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(1, 0, 2)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCuboid(1, 2, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaSphere(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaRectangle(0, 10)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaRectangle(10, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCylinder(0, 1)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCylinder(1, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaSquare(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTriangle(0, 1)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTriangle(1, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaParallelogram(0, 1)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaParallelogram(1, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(0, 1, 1)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(1, 0, 1)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaTrapezium(1, 1, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCircle(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaHemisphere(0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCone(1, 0)),
() -> assertThrows(IllegalArgumentException.class, () -> Area.surfaceAreaCone(0, 1)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(0, 4, 10)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(3, 0, 10)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(3, 4, 0)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(-3, 4, 10)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(3, -4, 10)),
() -> assertThrows(IllegalArgumentException.class,
() -> Area.surfaceAreaTriangularPrism(3, 4, -10))
);
}
}
}
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