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ykluhredd
27.02.2021 •
Mathematics
Find m\angle Am∠Am, angle, A.
Round to the nearest degree.
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Ответ:
m∠A = 106°
Step-by-step explanation:
All three sides of the triangle are given in the question.
To find the measure of included angle A between two sides we will apply cosine formula,
BC²= AB² + AC² - 2(AB)(AC)cosA
(13)² = (10)² + (6)² - 2(10)(6)cosA
169 = 100 + 36 - 120cosA
cosA =![\frac{-169+136}{120}](/tpl/images/1154/2224/f2d2b.png)
cosA = -0.275
A =![\text{cos}^{-1}(-0.275)](/tpl/images/1154/2224/9e468.png)
A = 105.96°
A ≈ 106°
Therefore, m∠A = 106° will be the answer.
Ответ:
c
Step-by-step explanation:
800-899 = 3 schools
900-999 = 5 schools
1000-1099 = 8 schools
1100-1199 = 6 schools
1200-1299 = 3 schools