Square pyramid lateral surface area = (1/2) perimeter x slant height

This type of question, asked 2 times: 16 Sep 2025 S1, 17 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
16 Sep 2025 S1
67 $If base perimeter = 40 cm, slant height = 10 cm, what is lateral surface area of square pyramid?$
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Question 2
17 Sep 2025 S2
65 $A square pyramid has lateral surface area equal to twice the base area. If base side = 6 cm, find slant height.$
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