What fraction of a straight angle is a right angle?
\(\dfrac{1}{2}\)
Step 1: Recall the sizes.
Right angle = \(90^{\circ}\)
Straight angle = \(180^{\circ}\)
Step 2: Write the fraction (part over whole).
Fraction = \(\dfrac{\text{size of right angle}}{\text{size of straight angle}}\)
Step 3: Substitute the values.
\(\dfrac{90^{\circ}}{180^{\circ}}\)
Step 4: Cancel the degree symbol.
\(\dfrac{90}{180}\)
Step 5: Simplify by dividing numerator and denominator by \(90\).
\(\dfrac{90\div 90}{180\div 90} = \dfrac{1}{2}\)
Answer: A right angle is \(\dfrac{1}{2}\) of a straight angle.