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Subjects
Mathematics State Board
Class 9
Mensuration
Heron's formula

1. Multiple choice question I

Exercise condition:

3 m.

1. The semi-perimeter of a triangle having sides \(15 \ cm\), \(20 \ cm\) and \(25 \ cm\) is:

\(30 \ cm\)
\(15 \ cm\)
\(45 \ cm\)
\(60 \ cm\)

2. If the sides of a triangle are \(3 \ cm\), \(4 \ cm\) and \(5 \ cm\), then the area is:

\(3 \ cm^2\)
\(12 \ cm^2\)
\(6 \ cm^2\)
\(9 \ cm^2\)

3. The perimeter of an equilateral triangle is \(30 cm\). The area is:

\(25 \sqrt{3}\) \(cm^2\)
\(10 \sqrt{3}\) \(cm^2\)
\(15 \sqrt{3}\) \(cm^2\)
\(12 \sqrt{3}\) \(cm^2\)

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