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Shaded Area is;
Area circle with diameter 30 cm - 7(area circle with diameter 10 cm)
= π(½(30))² - 7π(½(10))²
= π(15)² - 7π(5)²
= 225π - 175π
= 50π cm²
Sir Mike Ambrose is the author of the question.
Let CD = 2 units.
Therefore;
Calculating AB.
AB = 1 + (2sin18*tan72 + 2sin36)tan54
AB = 1 + 3.07768353717tan54
AB = 1 + 4.23606797749...
x² = (r+1)² - (r-1)²
Therefore x = 2√(r) unit.
y² = (r+1)² - (2√(r))²
Therefore y = √(r²-2r+1)
y = √(r-1)²
y = (r-1) unit
z = (r+1) - y
z = (r+1) - (r-1)
Therefore z = 2 units
a = r+...
Area R is;
Area sector with radius 8 cm and angle 20.16632290743° - Area triangle with height 8 cm and base (4.2sin 20.16632290743) cm
= ( 20.16632290743 *64π÷360) - (½*8*4.2sin 20.166322907...
