Sides
What is an equilateral triangle?
This triangle has all three sides the same length.
What is a right triangle?
A triangle with all angles that are 90°.
What is the total angle sum in any triangle.
180 degrees
What is an isosceles triangle?
This triangle has two sides the same length.
A triangle with all angles less than 90°.
an acute triangle?
an acute triangle
A triangle with a right angle also follows this famous rule. What is the rule called?
Pythagoras’ theorem
What is a scalene triangle?
This triangle has no sides the same length.
A triangle with one angle greater than 90°.
an obtuse triangle?
an obtuse triangle
A triangle has angles 45° and 55°. Find the third angle.
80°
What are the two base angles in an isosceles triangle?
These two parts are always equal.
A triangle has angles 40°, 60° and 80°. Classify it by angles.
an acute triangle
Can this make a triangle- 35°, 50°, 15°
No
A triangle has sides 4 cm, 4 cm, and 7 cm. Classify it by its sides.
an isosceles triangle?
A triangle has angles 30°, 60°, and 90°. Classify it by angles and sides.
right scalene triangle
What are 2 possible sizes for an obtuse angle with 1 angle that is 55°?
check answers