Answer:
62.2°
Explanation:
formula to count area of triangle
1) √[(s)(s-a)(s-b)(s-c)] , s= (a+b+c)/2
2) 1/2ab sin c
count the area first
s=(8+5+9)/2
=11
area=√[(11)(11-8)(11-5)(11-9)]
= √396
=19.8997
1/2(5)(9) sin c = 19.8997
sin c = 19.8997(2)/45
sin c = 0.8844
c = sin-¹ 0.8844
c = 62.2° (nearest tenth)