isi-entrance 2011 Q17

isi-entrance · India · solved Not Maths
Consider an equilateral triangle $ABC$ with side 2.1 cm. You want to place a number of smaller equilateral triangles, each with side 1 cm, over the triangle $ABC$, so that the triangle $ABC$ is fully covered. What is the minimum number of smaller triangles that you need?
(a) 4
(b) 5
(c) 6
(d) 7.
(C) Triangles BDE, CFG, AHI, JKL, MNO, PQR are needed. So the minimum number is 6. 
Consider an equilateral triangle $ABC$ with side 2.1 cm. You want to place a number of smaller equilateral triangles, each with side 1 cm, over the triangle $ABC$, so that the triangle $ABC$ is fully covered. What is the minimum number of smaller triangles that you need?\\
(a) 4\\
(b) 5\\
(c) 6\\
(d) 7.
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