Geometry of Triangles - Isosceles, Solve Angle from Single Angle (Level 1)

These problems are designed to develop skills in solving for unknown angles in isosceles triangles, specifically identifying the values of specific angles given limited information. Each question contains a diagram of an isosceles triangle with one angle labeled, and students are tasked with determining the value of another angle. The answers are presented in multiple-choice format, aimed at reinforcing understanding of triangle properties, particularly the fact that isosceles triangles have two angles that are equal. This topic is a part of a broader unit on geometry dealing with isosceles and equilateral triangles.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

Geometry of Triangles - Isosceles, Solve Angle from Single Angle Worksheet

Math worksheet on 'Geometry of Triangles - Isosceles, Solve Angle from Single Angle (Level 1)'. Part of a broader unit on 'Geometry - Isosceles and Equilateral Triangles' Learn online: app.mobius.academy/math/units/geometry_triangles_isosceles_equilateral_intro/

1

What do we know about angle 'Q'?

a

80

b

50

c

45

d

60

e

55

f

70

2

What do we know about angle 'R'?

a

45

b

55

c

60

d

70

e

90

f

50

3

What do we know about angle 'S'?

a

60

b

70

c

90

d

55

e

50

f

45

4

What do we know about angle 'Q'?

a

55

b

50

c

70

d

45

e

90

f

60

5

What do we know about angle 'R'?

a

50

b

70

c

80

d

55

e

45

f

60

6

What do we know about angle 'R'?

a

40

b

55

c

70

d

50

e

45

f

60

7

What do we know about angle 'R'?

a

45

b

70

c

50

d

40

e

60

f

55