Treat the parallelogram as a square (counting is unchanged). It has both diagonals and the four lines joining the midpoints of adjacent sides. Counting every triangle whose three sides lie along these lines gives 20.
More Spatial Aptitude: Spatial Reasoning and Visualization questions
GATE 2022 ES Q3– A trapezium has vertices P, Q, R, S in anticlockwise order, PQ∥SR, and side lengths…
GATE 2022 ES Q4– The figure is a 4×4 grid of unit squares with the unshaded cell representing a hole. How…
GATE 2022 ES Q5– The diagram shows an art gallery with opaque boundary walls. A stationary guard has a 360°…
GATE 2022 ES Q8– P=(0,1),Q=(0,−3),R=(−2,−1),S=(2,−1) are the vertices of a quadrilateral. Find its enclosed…
GATE 2022 ES Q10– In the square shown, P, Q, R, S mark its corners and T its center. X is a 180° rotation…
GATE 2021 ES Q3– Find the least number of squares to add to the shown arrangement so P–Q becomes a line of…
