Mp = 40°, m 1 = 40 50 90 130 (see picture)

m∠1 = 130°

Option 4 is correct

Step-by-step explanation:

Given that,

m∠P = 40°, PM ⊥ MO

In a right ΔPMO,

∠PMO = 90°, m∠P = 40°

∠1 is an exterior angle at vertex O

m∠1 = ∠PMO + m∠P       (Exterior angle property triangle)

Exterior angle: Sum of two interior angles of a triangle is equal to opposite exterior angle.

m∠1 = 90° + 40°

m∠1 = 130°

Hence, The measure of m∠1 = 130°

b

step-by-step explanation: