Work Step by Step
The area of a triangle can be calculated by multiplying two sides' length and the sine of their included angle. Hence here the area is: $20\cdot24\cdot\sin(87^\circ)\approx479.3$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.