Answer:
the answer is 9.75 :)
Step-by-step explanation:
you apply the concept of vertical angles and 180-degree angle
add 43 and 74 to get 117 now subtract it by 180 you get <u>63</u> for angle 1
now since angle 1 and 2 are vertical they are both <u>63</u>
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now for angle 3 you add 63 plus 79 is 142 so, we subtract 142 by 180
therefore, angle 3 is <u>38</u> degrees
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remember angles cannot be negative at all!
Answer:
≈ 18.3 m²
Step-by-step explanation:
The shaded area (A) is calculated as
A = area of sector - area of right triangle
area of sector = area of circle × fraction of circle
A = πr² ×
= π × 8² × = 64π × = 16π m²
area of triangle = × 8 × 8 = 4 × 8 = 32 m²
shaded area is then
A = 16π - 32 ≈ 18.3 m² ( to the nearest tenth )
<em>Chuong2: ƯỚC LƯỢNG THAM SỐ, môn thống kê ứng dụng</em>