Answer:
surface area of the triangular pyramid
=(1/2×9×7.8)+(3×1/2×9×12.3)
=35.1+166.05
=201.15 inch²
Answer: 70
Step-by-step explanation:
First you multiply 17x8 then you subtract it by 64 then you divide it by 2 please double check with a parent to make su