find the area of an isosceles triangle whose equal sides are of lengths equal to 15 cm each and third side is 12 CM
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using heron's formula I find the area of the triangle
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Answer:
18√21 cm²
Step-by-step explanation:
s = a + b + c ÷ 2
= 15 + `15 + 12 ÷ 2
= 42 ÷ 2
= 21
Area = √21(21-15) (21-15) (21-12)
= √21 × 6 × 6 × 9
= √7 × 3 × 3 × 2 × 3 × 2 × 3 × 3
= √(7 × 3) (3)² (3)² (2)²
= √(7 × 3)(3 × 3 × 2)
Area = 18√21 cm²
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