Page 13 - STEPS MATHEMATICS 4A

right-angle ' I

Naming angles measure

REMEMBER

Sharp angles smaller than
a right angle are called acute angles.

Blunt angles larger than
a right angle are called obtuse angles.

Use your right-angle measure to check whether the marked
angles are acute, obtuse or right angles.
Write the answers in your book.

2 Decide what sort of angles these are.
Write your answers in your book.

Keep trying if you
Use your ruler and right-angle measure
don't get them right
to draw a shape which has: straight away.
a 3 sides and 1 obtuse angle
b 4 sides and 2 acute angles
c 5 sides and 1 acute angle
d 6 sides and 3 acute angles.