87 x 57 = 4959
20000/4959 = 4.033071184
density = 4 fans per yard²
Of all numbers whose difference is 4, find the two that have the minimum product. 2 x2=4
Answer:
Step-by-step explanation:
From the given triangles in the picture attached,
∠A ≅ ∠X [Given]
∠B ≅ ∠Y [Given]
By AA property of similarity of the triangles, both the triangles will be similar.
ΔABC ~ ΔXZY
Similarity statement:
Corresponding sides of these similar triangles will be proportional.

Similarity ratio:

= 
= 3 : 2
Part A: Yes, Triangle DEF and DBC are the same triangle, but DBC is smaller than DEF because it is just a cut off of DEF.
Part B: I am pretty sure it is angle C.
Part C: I am pretty sure it is angle D.
-84 - 55
= -139
Here both have same sign (-) so u add and put the common sign(-) ....
So the answer is option B ( -139)...
Hope it helps!!!