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savannahvargas512
19.03.2020 •
Mathematics
Angle A is shown below.
What is the measure of LA, in degrees?
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Ответ:
The measure of angle A is 55°.
Solution:
Let us take B be the adjacent angle of 145°.
Sum of the adjacent angles in a straight line = 180°
⇒ m∠B + 145° = 180°
Subtract 145° from both sides.
⇒ m∠B + 145° - 145° = 180° - 145°
⇒ m∠B = 35°
The adjacent angle of 145° is 35°.
In the image, angle B and angle A equal to 90°.
⇒ m∠B + m∠A = 90°
⇒ 35° + m∠A = 90°
Subtract 35° from both sides.
⇒ m∠A = 55°
The measure of angle A is 55°.
Ответ:
∠A = 55°
Step-by-step explanation:
180° - 145° = 35°
∠a = 90° - 35° = 55°
Ответ:
23%, 0.634, 3/4, 8/10