Angles & Triangles

1.   Which one of the following angle is 70 $\degree$ ?

•  $\angle$ AOB
  

•  $\angle$ BOC

•  $\angle$ COD

•  $\angle$ BOD

Which one of the following angle is 115 $\degree$ ?

•  $\angle$ EOF

•  $\angle$ FOH

•  $\angle$ EOG

•  $\angle$ FOI

DOE is a straight line and $\angle FOD$ = $\angle GOE$ . Find $\angle GOE$ .

(a)  

EOG and HOF are straight lines. Which of the following statements is true?

• $\angle$ EOF = 70 $\degree$

• $\angle$ EOH = 70 $\degree$

• $\angle$ EOH = 110 $\degree$

• $\angle$ EOH + $\angle$ FOG = 180 $\degree$

XYZ is a straight line. Find $\angle$ UYV.

(a)  

EF and GH are straight lines. Find $\angle$ x.

(a)  

Find $\angle$ k in the figure.

(a)  

All triangles have at least 2 acute angles.

• Yup! That's right! :)

• Nah, that's incorrect! :(

• Wait! I'm not too sure about this! :I

An obtuse triangle has no acute angles.

• True!

• False!

• Hmm...I'm not too sure about this!

An equilateral triangle only has acute angles.

• Yup! That's true!

• That's definitely false!

• Ahhh! This is so confusing!