Pls solve Q20 with proper steps
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insiyahr:
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Answered by
2
Answer:
10
Step-by-step explanation:
Given: Area of circle = 9πx² - 12πx + 4π = π(9x² - 12x + 4)
We know that Area of circle = πr²
⇒ πr² = π(9x - 12x + 4)
⇒ r² = 9x² - 12x + 4
⇒ r² = (3x - 2)²
⇒ r = 3x - 2.
When x = 4:
⇒ r = 3(4) - 2
= 12 - 2
= 10 .
Therefore, radius of the circle is 10 cm.
Hope it helps!
Answered by
0
Answer:
10
Step-by-step explanation:
Area of circle = 9πx² - 12πx + 4π
= π(9x² - 12x + 4)
Area of circle = πr²
πr² = π(9x - 12x + 4)
r² = 9x² - 12x + 4
r² = (3x - 2)²
r = 3x - 2.
When x = 4:
r = 3(4) - 2
12 - 2
10 .
Therefore, radius of the circle is 10 cm.
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