A television with a 5:4 screen shows an image with a ratio of 20:12 which creates a letter boxed image. What percent of the scre
en's area is occupied by the image
5x
20y
12y 4x
А
12%
B
25%
С
33%
u
D
75%
5x
20y
12y 4x
А
12%
B
25%
С
33%
u
D
75%
2 answers:
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Answer:
m∠B = .
Step-by-step explanation:
Since the three sides of the triangle are given, then we apply cosine rule.
=
+
- 2ac Cos B
But, a = 660 cm, b = 680 cm, and c = 100 cm.
So that;
=
+
-2(660 x 100) Cos B
462400 = 435600 + 10000 - 132000 Cos B
462400 = 445600 - 132000 Cos B
132000 Cos B = 445600 - 462400
= -16800
Cos B =
= -0.1273
B = -0.1273
=
Thus, measure of ∠B is .
The value would just be the answer which is 104
