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u must use pythagor theorem to find out
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Image A is "made" to fill it all out, so changing the amount of cubes by changing the figures, ofc it will make them be empty.
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few cubes were moved around in image B thats all.
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Triangle ABC:
The green triangle's base & the red triangles's right side makes two sides of length 5 & 3 units respectively.
Number of blocks required to fill the rectangle: 5*3 = 15
Triangle DEF:
The red triangle's base & the green triangles's side makes two sides of length 8 & 2 units respectively.
Number of blocks required to fill the rectangle: 8*2 = 16
The objects orange and green have a maximum of 15 blocks together arranged in any way.
To completely fill triangle DEF, you need one more block (16-15 = 1). There's how.
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The green triangle was flipped around creating the hole? Meh