Answer:
84
Step-by-step explanation:
Since angles UDR and ADR are congruent, triangles APD and UMD must be similar. Therefore, the ratio of the height of the big triangle to the side of the small triangle with length 4.5 is the same as the ratio of 10 to 3.75. Therefore, the height of the big triangle is 12, and the area is bh/2=14*12/2=84 square units. Hope this helps!
