Q. ∠1 and ∠2 are supplementary angles. If m∠1=(2x+21)∘ and m∠2=(3x+24)∘, then find the measure of ∠1.Answer:
Set up equation: Supplementary angles add up to 180 degrees. We can set up an equation with the given expressions for m/angle 1 and m/angle 2 to find the value of x.Calculation: (2x+21)+(3x+24)=180
Simplify equation: Combine like terms to simplify the equation.Calculation: 2x+3x+21+24=1805x+45=180
Isolate x: Subtract 45 from both sides to isolate the term with x.Calculation: 5x+45−45=180−455x=135
Solve for x: Divide both sides by 5 to solve for x.Calculation: 55x=5135x=27
Find angle measure: Now that we have the value of x, we can find the measure of angle 1 by substituting x back into the expression for m/angle 1.Calculation: m/angle 1=2x+21m/angle 1=2(27)+21m/angle 1=54+21m/angle 1=75 degrees