1. Match up the triangles below with the names:
isosceles triangle
equilateral triangle
scalene triangle
right-angled triangle
obtuse-angled triangle
a.  |
b.  |
c.  |
d.  |
e.  |
2. Find the size of the angles marked by letters and give reasons from the list below.
(Adj. ∠ s on st. line)
(Vert. opp. ∠ s )
(∠ sum of Δ )
(ext ∠ of Δ = sum int. opp.∠ s)
(base ∠ s of isos. Δ )
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a. |
b.
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c.
|
|
d.
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e.
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f.
|
|
g.
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h.
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i.
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