Answer:

Step-by-step explanation:
To find the area of a triangle, we can use the formula of:

This formula comes from the area of a rectangle, because a triangle is half a rectangle.
Answer:
5
Step-by-step explanation:
5*5*5 = 125.. hope this helped you.. Have a nice day..
Answer:
100 in square
Step-by-step explanation:
LSA of square based pyramid = 2×a×l
= 2×5×10
= 100 in square
Probably be what if the teacher had a number -10