fatlenny
07.04.2020 •
Mathematics
Please help! I will mark you as brainliest!
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Ответ:
105.6 cm²
Step-by-step explanation:
Area of full circle = π × r²
Semicircle = Half it
3.142 × 8.2² = 211.26808 ( Full circle)
211.26808 ÷ 2 = 105.63404
105.6 cm²
Ответ:
105.6 cm²
Step-by-step explanation:
The area (A) of a circle is calculated as
A = πr² ( r is the radius ), thus the area of a semicircle is half the area of the circle, that is
A =
πr² ( with r = 8.2 )
A = 0.5 × 3.142 × 8.2²
= 0.5 × 3.142 × 67.24 ≈ 105.6 cm² ( to 1 dec. place )
Ответ:
B) BD = DC
Step-by-step explanation:
If AD is a perpendicular bisector of BC with point D on segment BC, then point D is the midpoint of the segment. (That's what "bisector" means.) Each half of the segment is congruent to the other half:
BD = DC