Answer:
63 cm²
Step-by-step explanation:
If you put two triangles together, you can form a parallelogram. Now, what is the formula to find the area of a parallelogram? Simple!
Length × width = area.
So, we can take half of this area to find the area of the triangle we originally started with.
Formula:
base × height ÷ 2 = area
21 × 6 = 126
126 ÷ 2 = 63
Therefore, 63 would be the correct answer.
