right angled triangle
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The shape that has 3 sides and 1 right angle is a right triangle. In a right triangle, one of the angles measures 90 degrees, which is a right angle. The other two angles are acute, measuring less than 90 degrees each. The Pythagorean theorem can be used to calculate the lengths of the sides in a right triangle.
triangle
Oh honey, we're talking about rectangles here. They're like the cool kids of the quadrilateral world with their four sides and two right angles. So next time you see a shape with those specs, just remember it's a rectangle strutting its stuff.
It depends on how many sides the spinner has, a detail that was not provided in the question. If the spinner has 7 sides, and there is only one 3, then the probability of landing on a 3 is 1 in 7, or about 0.1429.
a circle
1/2 Because there is one side with heads (1/) and the total sides (/2)