If the measure of arc ac is 140°, what is the measure of angle abc?

The measure of angle ∠ABC=40°.

Step-by-step explanation:

Since we have given that

Measure of the arc AC = 140°

So, ∠AOC = 140° (Arc angle is equal to central angle)

And we know that "Radius is the perpendicular to the tangent".

∠A=∠C=90°

So, In AOCB,

∠A+∠O+∠C+∠B=360°

90°+140°+90°+∠B=360°

320°+∠B=360°

∠ABC=360°-320°

∠ABC=40°

Hence, The measure of angle ∠ABC=40°.

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation: