Can You Find The Area?
- Francis
- Aug 24
- 2 min read
Updated: Aug 24
The following question was asked in China's Primary School. Look at the picture and comment your answer with explanation!
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Comment the correct answer with an explanation.
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The winner for this quiz is Sana.
49pie m per 2
Given:
d = 14
i . e .
r = d/2 = 14/2 = 7
Formula :
Area of a circle = 2 pie meter Sq.
= 2 × 22/7 × 7 meter Sq.
= 2 × 22 meter Sq.
= 44 meter Sq.
Hence solved.
49πsq2m
Let us take radius of the outer circle be R and the radius of the inner circle be r .
Chord of the outer circle = 14m
Half of the chord length = 14/2 = 7
R² = r² + 7² ( Pythagoras theorem )
R² - r² = 49 ---------- (1)
Area of outer circle = πR²
Area of inner circle = πr²
Area of the blue ring = πR² - πr² =π( R² - r²) --------- (2)
Substitute (1) in (2)
Area of the blue ring = π(49) square meters.
The area of the blue ring 49π is square meters.