Use a net to find the surface area of the regular triangular pyramid
7.6 m
6.9 m
8 m
The surface area is m?

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap

21

jk it's 20

step-by-step explanation:

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x