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2) อันดาอยู่บนหน้าผาริมทะเลมองลงมาเห็นเรือ 2 ลำเป็นมุมก้ม 30 และ 60 จากระดับสายตา ตามลำดบ ถ้าเรือ
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ทั้งสองลำอยู่ห่างกัน 400 เมตร จงหาว่าหน้าผาสูงกี่เมตร โดยไม่คิดความสูงของอันดา
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