i’m not really sure how to do geometry - can someone please help ?

Answer:
144 cm squared
Step-by-step explanation:
For this question, use the formula for area of a triangle (A = 1/2 * base * height)
Plug in the numbers you have, and A = 1/2 * 18 * 16, or 144 cm squared.
Hopefully this helps - let me know if you have any questions!