Home › CBSE Class 9 › Mathematics › Perimeter and Area › Using Heron's formula, the area of the 3, 4, 5 t…
Using Heron's formula, the area of the 3, 4, 5 triangle is:
ATwo
BFour
CSix
DTen
Answer & Solution
Correct answer: C. Six
1. The semi-perimeter is 6.
2. Heron's formula gives the root of 6 times 3 times 2 times 1.
3. That root is 6 square units.
4. So the answer is six.
_Source: NCERT Class 9 Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
Related questions
An arc's length depends on the angle it subtends at the:The length of a semicircle of radius r is:Which shapes are always cyclic?Who found a formula for the area of a cyclic quadrilateral?Heron's formula finds a triangle's area from its:For a triangle of sides 3, 4 and 5, the semi-perimeter is:The semi-perimeter of a triangle is:Two congruent triangles fitted together make a: