Answer:
A)
Step-by-step explanation:
Edg 2020
Answer:
the second one
Step-by-step explanation:
Answer:
315 sq. in
Step-by-step explanation:
15 * 21 = 315
If you know the base and area of the triangle, you can divide the base by 2, then divide that by the area to find the height. To find the height of an equilateral triangle, use the Pythagorean Theorem, a^2 + b^2 = c^2.