Triangles

The angles of a triangle always add up to...
1. 90º
2. 135º
3. 180º
4. 360º
A triangle with all three equal sides is...
1. Obtuse
2. Acute
3. Isosceles
4. Equilateral
Which triangles are isosceles in this picture?
1. Triangle A
2. Triangle B
3. Triangle C
4. Triangle D
Which triangle is obtuse in this picture?
1. Triangle A
2. Triangle B
3. Triangle C
4. Triangle D
Which triangles are acute in this picture?
1. Triangle A
2. Triangle B
3. Triangle C
4. Triangle D
A scalene triangle has...
1. all three sides of equal length.
2. at least two sides of equal length.
3. all three sides of different length.
4. all three sides acute.
Which triangles are right in this picture?
1. Triangle A
2. Triangle B
3. Triangle C
4. Triangle D
The angles of an equilateral triangle are equal, so all of them have the same measure, but how many degrees does each one have?
1. 60º
2. 90º
3. 75º
4. 45º
How many degrees are the angles of this triangle (set square)?
1. A=45º, B=90º, C=60º
2. A=30º, B=60º, C=90º
3. A=60º, B=90º, C=45º
4. A=30º, B=90º, C=60º
How many degrees are the angles of this triangle (set square)?
1. A=45º, B=90º, C=60º
2. A=45º, B=90º, C=45º
3. A=60º, B=90º, C=45º
4. A=30º, B=90º, C=30º