Page 18 - 新思维数学活动用书5 样章
P. 18
2.1 Triangles
3 Label the angle at each vertex of these triangles ‘acute’, ‘obtuse’ or ‘right angle’.
a a
b
A
B b
c
c
a
C
b
c
Practice
4 Draw a scalene triangle using a ruler and pencil.
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