
Concept explainers
To prove: The length of line joining the midpoints of two sides of a

Explanation of Solution
The figure can be drawn as:
The coordinates of S will be:
=(0+a2,0+h2)=(a2,h2)
The coordinates of T will be:
=(a+b2,0+h2)=(a+b2,h2)
The length of BC will be:
BC=√(x2−x1)2+(y2−y1)2BC=√(b−0)2+(0−h)2BC=√b2+h2
The length of AB will be:
AB=√(x2−x1)2+(y2−y1)2AB=√(b−0)2+(0−0)2AB=√b2+0AB=b
The length of ST will be:
ST=√(x2−x1)2+(y2−y1)2ST=√(a+b2−a2)2+(h2−h2)2ST=√14b2+0ST=12bHence,ST=12(AB)
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