Find the sizes of the angles marked by letters and give reasons chosen from below:
| (Adj. ∠ s on st. line) | (base ∠ s of isos. Δ ) |
| (Vert. opp. ∠ s ) | (rad. ⊥ tang.) |
| (∠ sum of Δ ) | (∠ in a semi-circle) |
| (ext ∠ of Δ = sum int. opp.∠ s) | (∠ s at a point) |
| (by symmetry) |
The angles may be found in any order, not necessarily alphabetically!
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a.
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b.
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c.
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d.
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e.
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f.
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g.
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h.
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i.
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