Answer: 55
Step-by-step explanation: you break it apart into 5*5 which is 25. You break 12 in half because you need to know how much the triangle area is. You get 6*5 which is 30. 30 and 25 added will get you answer 55.
(Make sure with others.)
A=1/2(12+5)5
1/2(17)5
8.5(5)
42.5 square units
