Awnser is A 6+4 divided by [2+1]x3
10! This is the correct answer for apex
SAS, two sides are congruent and the angles are equal
(9 × 10) + (20x + 21) = 571
90 + 20x + 21 = 571
111 + 20x = 571
- 111
20x = 460
÷ 20
x = 23
I hope this helps!
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