Four road signs are shown. Exactly one of them has two lines of symmetry. Which one is it?
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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.
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Four road signs are shown. Exactly one of them has two lines of symmetry. Which one is it?
The L-shaped figure is made of unit squares. What is its perimeter?
In a triangle, one angle is 90 degrees and another is 35 degrees. What is the third angle?
What is the angle between the hands of a clock at exactly 3 o'clock?
Which of these arrangements of six squares cannot be folded into a closed cube?
Three angles of a quadrilateral are 80, 95 and 110 degrees. What is the fourth angle?
Which capital letter, printed plainly, has both a horizontal and a vertical line of symmetry?