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แบบฝกหัดที่ 3
1. จงหาปริมาตรและพื้นที่ผิวทั้งหมดของพีระมดที่สูง 6 เซนติเมตร ฐานเปนรูปสี่เหลี่ยมจัตุรัส ยาวดานละ 16
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เซนติเมตร
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2. จงหาพื้นที่ผิวเอียงของพีระมดฐานรูปหกเหลี่ยมดานเทา มุมเทา ยาวดานละ 4 เซนติเมตร สูงเอียง 7.5
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เซนติเมตร
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