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In a right-angled triangle, if the hypotenuse is 10 units and one of its sides is 8 units then find the area of the triangle.
48 sq. units
16 sq. units
32 sq. units
24 sq. units
24 sq. units
Use the 3-4-5 Pythagorean triple scaled by 2: (6, 8, 10). The area is simply 21×6×8=24.
In a right-angled triangle, the hypotenuse = 10 units, and one of the sides = 8 units.
a2+b2=c2, Area=21×base×height
Use the 3-4-5 Pythagorean triple scaled by 2: (6, 8, 10). The area is simply 21×6×8=24.
Confusing the hypotenuse for one of the perpendicular sides, or forgetting the factor of 21 in the area formula.
Identify Pythagorean Triple
Since the triangle is right-angled, we use the Pythagorean theorem a2+b2=c2. Given hypotenuse c=10 and one side a=8.
82+b2=102⟹64+b2=100
Solve for the missing side
Subtract the square of the given side from the hypotenuse square to find the other side b.
b2=100−64=36⟹b=36=6
Calculate Area
Use the formula for the area of a right-angled triangle, which is half the product of the two perpendicular sides (base and height).
Area=21×6×8=24 sq. units
D is correct because the sides of the triangle are 6, 8, and 10, resulting in an area of 24 sq. units.
Always check for common triples like (3,4,5), (5,12,13), and (8,15,17) to save time in geometry problems.