Which operation should you perform last in the expression 12 × 4^2?
1 answer:
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Answer:
The Radius of circle is 7.15 cm
Step-by-step explanation:
Given as :
A Triangle is inscribed into circle
The center of circle is O
The Diameter of circle = AK = d
The hypotenuse of triangle being the diameter of circle
The Area of triangle = 50 cm²
Let The radius of circle = r cm
The Triangle is right angle at c
So , ∠ACK = 90°
∠CAK = 42°
∠AKC = 180° - (90° + 42°)
So, ∠AKC = 48°
Now, ∵ Area of triangle ACK = 50 cm²
So, × AC × CK = 50
Or, AC × CK = 50 × 2
i.e , AC × CK = 100 ..........1
From figure
Sin 48° =
Or, 0.74 =
∴ AC = 0.74 d ..........2
<u>Similarly</u>
Sin 42° =
Or, 0.66 =
∴ CK = 0.66 d .............3
<u>Putting eq 2 and 3 value into eq 1</u>
i.e AC × CK = 100
Or, 0.74 d × 0.66 d = 100
Or, 0.4884 × d² = 100
∴ d² =
Or, d² = 204.75
Or, d =
Or, d = 14.30
So, The diameter of circle = d = 14.30 cm
Now, Radius of circle =
Or, r =
i.e r = 7.15 cm
So, The Radius of circle = r = 7.15 cm
Hence, The Radius of circle is 7.15 cm Answer
