3

12

15

18

$81^o$

$91^o$

$99^o$

$101^o$

Yes

No

70 cm

80 cm

100 cm

125^o

45^o

60^o

35^o

Acute Triangle

Right Triangle

Obtuse Triangle

No, the shape won't close.

Yes, the two shorter sides add up to be larger than the third side.

There is not enough information.

Isosceles Triangle

Scalene Triangle

Equilateral Triangle

None of the Above

Isosceles Triangle

Scalene Triangle

Equilateral Triangle

None of the Above

Acute Triangle

Right Triangle

Obtuse Triangle

130^o

50^o

40^o

None of the Above

Their angle measures add up to 180^o.

Corresponding angles in similar triangles change with a scale factor.

The sum of the two shortest sides in a triangle must be larger than the third side.

Triangles are not polygons.

Similar

Congruent

Different Sizes

Right Triangles

10  $cm^2$  

13  $cm^2$  

20 $cm^2$  

40  $cm^2$  

54 $cm^2$

108 $cm^2$

27 $cm^2$

12 $cm^2$

x=50^o, y=63^o, z=32^o

x=50^o, y=63^o, z=63^o

x=67^o, y=63^o, z=42^o

x=67^o, y=63^o, z=32^o