Calculating r, radius of the smaller semi circle.
Radius of the bigger semi circle a, is;
a = ½(3+7+2)
a = 6 units.
6² = r²+b²
36-r² = b²
b = √(36-r²) units.
c = 6-3.5-2
c = 0.5 units.
b² = d²+0.5²
√(36-r²)² = d²+0.25
d² = 36-0.25-r²
d² =35.75-r²
d = √(35.75-r²) units.
r² = d²+3.5²
r² = √(35.75-r²)²+3.5²
2r² = 35.75+12.25
2r² = 48
r² = 24
r = √(24)
r = 2√(6) units.
r = 4.8989794856 units.
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