A group of newborn 100 dalmations are given numbers for easier identification. A sample of 10 were taken. If the following numbers were assigned:
6, 15, 28, 36, 42, 59, 67, 71, 80, 95
Identify which sampling method was used:

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

11 12 triangle abc is congruent to triangle fde, and both triangles have the same orientation, as shown. what is the slope of df, which is also the slope of ac?