kroscioouws0q
02.03.2021 •
Mathematics
1.3*0.4+2.4*0.3-1.8*0.2
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Ответ:
A ≈ 35.3 units²
Step-by-step explanation:
Calculate the radius CB using Pythagoras' identity in the right triangle.
CB² + AB² = AC²
CB² + 6² = 9²
CB² + 36 = 81 ( subtract 36 from both sides )
CB² = 45 = r²
Then area of quarter circle is
A =
× πr² = 
× π × 45 ≈ 35.3