In the figure, name four points that are coplanar. B
A
L
F
G
L, A, C, G
G, D, L, B
C, K, A, G
K, B, D, L

CKAG are the coplanar points given, as they all fall on the closest triangular face.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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