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  1. The diagonal of a right angle isosceles triangle is 5 cm. Its area will be
    1. 5 sq.cm
    2. 6.25 sq.cm
    3. 6.50 sq.cm
    4. 12.5 sq.cm
Correct Option: B

Using Rule 1,

x² + x² = (5)² ⇒ 2x² = 25

⇒ x² =
25
⇒ x =
5
2√2

Area =
1
 ×
5
 ×
5
2√2√2

=
25
 = 6.25 sq.cm
4


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