1st, let's calculate the side AB = c in applying the law of cosine:
AC² = BC²+AC² - 2AB.BC. cos87°)
c²= 10.1²+9.8²-2(10.1)(9.8)(cos(87)
c²=102.01 + 96.04 -196.96cos(87)
c² = 187.74 and c = 13.7
Having calculated the 3rd side, now we can apply Heron's formula for the area:
AREA = √p(p-a)(p-b)(p-c), where p is half the perimeter or p=(a+b+c)/2 =16.8
AREA = √16.8(16.8-10.1)(16.8-9.8)(16.8-13.7)
AREA = 49.42 OR 49.4 unit²
Www.addall.com/ is the one i know of
Try you best and look it up
but also yhu could just do what i do and just look at what it saids and reread it
Answer:
65 degrees
Explanation:
m<3 and m<5 are vertical angles.
Based on the vertical angles theorem,
m<3 is congruent to m<5.
Therefore, if m<5 is given as 65°, thus:
m<3 = 65°
