An isosceles triangle has perimeter 30 cm and each of the equal side is 12 cm find the area of a triangle
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An isosceles triangle has perimeter 30 cm and each of the equal side is 12 cm find the area of a triangle
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Answer:
34.86 sq cm
Step-by-step explanation:
Perimeter = 30 cm
each of the equal side = 12 cm
third side = 30 --(12+12)
= 30--24
= 6 cm
When all three sides are given,
Area = 1/2 ( √a^2--b^2/4) b
where a= dimension of equal side = 12 cm
b = third side = 6 cm
Area = 1/2 { √ (12)^2--(6)^2/4 } 6
= 1/2 { √ 144--9 } 6
=3 { √ 135}
=3(11.62)
= 34.86 sq cm