If the angle by Luke is 45⁰ then the height of the tree will equal the distance that Luke is from the tree. Although because Luke was using the clinometer at eye level, the height of the tree is the distance Luke is from the tree plus his height.
642 centimetres + 139 centimetres = 781 centimetres.
Therefore our tree is 781 centimetres or 7.81 metres tall.
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