In a ΔABC D, E, F are midpoints of sides BC, AC, AB respectively. If D, E, F are joined to A, B, C respectively to meet at a common point G, then select the correct options.
A
There are 6 triangles formed with G as one of the vertex.
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B
G is the centroid of the triangle.
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C
GD is a part of median.
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D
BGC is a triangle.
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Solution
The correct options are B G is the centroid of the triangle. C GD is a part of median. D BGC is a triangle. New triangles formed with G as one of the vertex are 9, which are ΔAGF, ΔBGF, ΔAGB, ΔBGD, ΔDGC, ΔBGC, ΔCGE, ΔEGA and ΔCGA.
G is centroid formed by the intersection of medians AD, BE and FC. We can see that GD is the part of the median AD. ΔBGC is a triangle newly formed.