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Find the area of a triangle from its base and perpendicular height

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Question 1

A triangle has a base of 13 cm and a perpendicular height of 16 cm. Its slanting side is 18 cm. What is its area?

A triangle has a base of 13 cm and a perpendicular height of 16 cm. Its slanting side is 18 cm. What is its area?
Question 2

A triangle has a base of 6 cm and a perpendicular height of 3 cm. Its slanting side is 4 cm. What is its area?

A triangle has a base of 6 cm and a perpendicular height of 3 cm. Its slanting side is 4 cm. What is its area?
Question 3

A triangle has a base of 12 cm and a perpendicular height of 8 cm. Its slanting side is 12 cm. What is its area?

A triangle has a base of 12 cm and a perpendicular height of 8 cm. Its slanting side is 12 cm. What is its area?

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