Question

please let me know the sum​

Answer 1

Answer:

12 cm

Step-by-step explanation:

Find semiperimeter (s) of triangle = 42cm

Apply Heron's Formula = $\sqrt{(s)*(s-side 1)*(s-side 2)*(s-side 3) }$ = 336 cm^2

This is same as area of parallelogram = base * height

Therefore, 336/28 = height = 12cm