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altitude base BC bisects Calculate centimetres centre chord circle of radius circumference circumscribed common tangent Construct a triangle cyclic quadrilateral Data ABC diagonal diameter distance divided Draw a circle Draw a straight edge equal circles equiangular equidistant equilateral triangle equivalent exterior angles find a point Find the area fixed point Give a proof given circle given line given point given straight line hypotenuse inch paper inscribed intersect isosceles trapezium isosceles triangle locus of points meet mid-point miles obtuse obtuse-angled opposite sides parallelogram pentagon Plot the locus produced protractor prove quadrilateral ABCD radii rect rectangle reflex angle regular polygons Repeat Ex rhombus right angles right-angled triangle segment set square sides equal similar triangles subtends tangent Theorem trapezium triangle ABC units of length vertex vertical angle
Side 90 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Side 208 - If a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.
Side 344 - Pythagoras' theorem states that the square of the length of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the lengths of the other two sides.
Side 272 - If a straight line touch a circle, and from the point of contact a chord be drawn, the angles which this chord makes with the tangent are equal to the angles in the alternate segments.
Side 188 - This sub-division shows that the square on the hypotenuse of the above right-angled triangle is equal to the sum of the squares on the sides containing the right angle.
Side 208 - If a straight line be divided into two equal parts, and also into two unequal parts, the rectangle contained by the unequal parts, together with the square on the line between the points of section, is equal to the square on half the line.
Side 138 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line.
Side 216 - A point moves so that the sum of the squares of its distances from the points (0, 0), (1, 0) is constant.