Problem 1

Can 30cm, 40cm, 80cm be the sides of a triangle?

Allowed answers: yes, no.

Problem 2

Can 70cm, 60cm, 100cm be the sides of a triangle?
Allowed answers: yes, no.

Problem 3

Can 30°, 40° and 100° be the angles of a triangle?

Allowed answers: yes, no.

Problem 4

Can 20°, 60° and 95° be the angles of a triangle?

Allowed answers: yes, no.

Problem 5

Can 50°, 53° and 77° be the angles of a triangle?

Allowed answers: yes, no.