HELP!! I NEED THIS ASAP!!!
1 answer:
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Answer:
Step-by-step explanation:
In the question, we're given . Therefore, the measure of these two angles must be equal.
To find the value of , set these two angles equal to each other:
Add 26 and subtract from both sides:
Divide both sides by 3:
Since was labelled as
, substitute
to find its measure:
You can also substitute into the label of angle D as angle A is congruent to angle D for easier calculations (
).
Answer:
Option (3)
Step-by-step explanation:
By applying cosine rule in the triangle ABC,
BC² = AC² + AB² - 2(AC)(AB)cosA
5² = 3² + 7²- 2(3)(7)cosA
25 = 9 + 49 - 42cos(A)
25 = 58 - 42cos(A)
cos(A) =
A =
A = 38.21°
A ≈ 38°
Option (3) will be the correct option.