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Parallelogram

Parallelogram is the quadrangle that has opposite sides parallel. Example: h is the height of the parallelogram. The intersection point of the diagonals (E) is called the center of symmetry. We will highlight some parallelograms below. Next: Rectangle, Diamond, Square and Trapezoid
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Compound interest

The compound interest scheme is the most common in the financial system and is therefore the most useful for calculating day to day problems. Interest generated for each period is incorporated into the principal for the calculation of interest for the following period. We call capitalization the moment interest is incorporated into the principal.
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Challenge 107

Complete the Letter Sequence Difficulty Level: Complete the Sequence: S, T, Q, __, __, __, __ Challenge 106 Radigunda Needs Money Challenge Index Next >> Challenge 108 The Rooms and the Lamps
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Continuous ratio

Consider the following ratio:. Note that your means are equal, so it is called continuous proportion. Thus: Continuous proportion is any proportion of equal means. In general, a continuous proportion can be represented by: Third Proportional Given two non-null natural numbers a and b, the third proportional of these numbers is called x such that: Example: Determine the third proportional number 20 and 10.
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Determination of a plan

Recalling that by postulate 5, a single plane passes through three non-collinear points. A plane can also be determined by: a line and a point not belonging to that line: two competing distinct lines: two distinct parallel lines: Next: Relative positions of line and plane
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Riddle - Man, women and cats

A man was going to Bahia with his seven sisters. Each sister carried seven boxes, each box had seven cats, each cat had seven puppies. How many were going to Bahia? Answer 1 man + 7 women = 8 people Each woman with 7 boxes (7x7 = 49 boxes) Each box with 7 cats (49x7 = 343 cats) Each cat with 7 kittens (343x7 = 2401 kittens) So 8 + 343 + 2401 = 2752 (remembering that the 49 boxes are not living beings and therefore are not added).
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