a.
a = 47.5° (base ∠ s of isos. Δ )
b = 47.5° (∠ sum of Δ )
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b.
d = 25° (base ∠ s of isos. Δ )
c = 130° (∠ sum of Δ )
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c.
f = 16° (base ∠ s of isos. Δ )
e = 148° (∠ sum of Δ )
g = 102° (∠ s at a point)
h = 39° (base ∠ s of isos. Δ )
i = 39° (∠ sum of Δ )
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d.
j =90° (∠ in a semi-circle)
k = 54° (∠ sum of Δ )
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e.
n = 29° (base ∠ s of isos. Δ )
l = 61° (∠ in a semi-circle)
m = 61° (base ∠ s of isos. Δ )
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f.
q = 90° (rad. ⊥ tang.)
r = 55° (∠ sum of Δ )
p = 35° (by symmetry)
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g.
s = 90° (rad. ⊥ tang.)
t = 55° (∠ sum of Δ )
u = 90° (rad. ⊥ tang.)
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h.
w = 90° (rad. ⊥ tang.)
v = 26° (∠ sum of Δ )
x = 26° (by symmetry)
y = 64° (by symmetry)
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i.
c = 90° (∠ in a semi-circle)
b = 23° (∠ sum of Δ )
a = 23° (Adj. ∠ s on st. line)
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