Question:
Construct a quadrilateral ABCD in which AB = 4 cm, AC = 5 cm, AD = 5.5 cm and ∠ABC = ∠ACD = 90°.
Solution:
Steps of construction:
Step 1: Draw $A B=4 \mathrm{~cm}$
Step 2: Make $\angle B=90^{\circ}$
Step 3: $A C^{2}=A B^{2}+B C^{2}$
$5^{2}=4^{2}+B C^{2}$
$25-16=B C^{2}$
$B C=3 \mathrm{~cm}$
With $B$ as the centre, draw an arc equal to $3 \mathrm{~cm}$.
Step 4: Make $\angle C=90^{\circ}$
Step 5: With $A$ as the centre and radius equal to $5.5 \mathrm{~cm}$, draw an arc and name that point as $D$.
Then, $A B C D$ is the required quadrilateral.