Question

Please answer this question step by step​

Answer 1

So we know Area of triangle = $\frac{1}{2} bh$ or 2 x Area of triangle = base x height

b- base, h- height

So

1st case: 87 x 2 =  15 x h

                  h = 11.6 cm

2nd case : 1256 x 2 = b x 31.4

                   b = 80 mm

3rd case : 170.5 x 2 = 22 x h

                  h = 15.5 cm

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Answer 2

Hope it helps
Solve the rest by the same method