If m<AOC=90 and m<AOB=20. Find m<BOC.

There must be a figure that goes with that question. It is not a triangle, since you have mentioned four points: A, B, C and O. Please describe the situation.

Does m< indicate the measure of an angle that follows, in degrees? I am not familiar with that notation.

El merge pe ora cu masina 5 kilometri,iar cealalta masina 2 kilometri pe ora

To find the measure of angle BOC, we can use the property that the sum of the measures of the angles in a triangle is always 180 degrees.

Given that angle AOC is a right angle (m<AOC = 90 degrees) and angle AOB measures 20 degrees (m<AOB = 20 degrees), we can use this information to find angle BOC.

Since angle AOC is a right angle, it measures 90 degrees. And since the sum of the three angles in a triangle is 180 degrees, we can subtract the measures of angles AOC and AOB from 180 degrees to find the measure of angle BOC.

Let's calculate:

m<BOC = 180 degrees - m<AOC - m<AOB
= 180 degrees - 90 degrees - 20 degrees
= 70 degrees

Therefore, the measure of angle BOC is 70 degrees.