The sum of the angles of a rectangle is?
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The sum of the angles of a rectangle is always 360 degrees. Four angles of 90 degrees each; you will always get 360 anyway you add them up. \n\nReminds me of 360 degrees in a circle. Full circle.
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Once again you will see that this is a rectangle.\nA = length times width\nA = 7*2\nA = 14
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1.rectangle\n\n2.trapezoid
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R^2=A^2+B^2 -2(A*B)cos(180-acute angle)
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a^2 + b^2 = c^2\n\nthis assumes right angles, a and b are the length and width, c is the diagonal
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x + 2x + x +2x = 72\n6x=72\nx=12\n\nTherefore the rectange is 12 by 24 units.
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find the angle between two sides.
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The sum of the measures of the EXTERIOR angles is always 360.  So subtract 162 from 180 to get an exterior angle (18) then divide 360 by 18 to see how many sides.
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[Note: < denotes angle]\n\n<A + <B +<C = 180 \n(Because, in a triangle, sum of the angles is 180)\n\n<B + <C = 180 - <A\n<B + <C = 180 - 40\n<B + <C = 140.......(1)\n\nBecause this is an isosceles triangle, AB = AC,  the angles opposite the equal sides are equal (congruent), \ntherefore <B = <C ........ (2)\n\nSubstituting value of <B from (2) to (1), we get:\n\n<C + <C = 140\n\n2 * <C = 140\n\n<C = 140/2 = 70\n\n<C is the angle opposite line AB, which is 70 degrees.
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Formula for sum of internal angles is 180*(n-2)\n\n(n-2) * 180 = 1260\n\n(n-2) = 7\n\nn = 9\n\nANSWER : c) 9
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an angle that is inside a circle or any other figure
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Pythagoras’ Theorem \n"For any right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.” \n\na2 + b2 = c2
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A square is a rectangle, because by definition, a rectangle is any four sided shape with four right angles.  A rectangle can be a square when all four sides are equal, but not all rectangles are squares.\n\nHope this helps!
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In geometry, a rectangle is defined as a quadrilateral polygon in which all four angles are right angles.\n\nFrom this definition, it follows that a rectangle has two pairs of opposite sides of equal length; that is, a rectangle is a parallelogram. A square is a special kind of rectangle where all four sides have equal length; that is, a square is both a rectangle and a rhombus. A rectangle that is not a square is colloquially known as an oblong.\n\nOf the two opposite pairs of sides in a rectangle, the length of the longer side is called the length of the rectangle, and the length of the shorter side is called the width. The area of a rectangle is the product of its length and its width; in symbols, A = lw. For example, the area of a rectangle with a length of 5 and a width of 4 would be 20, because 5 × 4 = 20. See the picture above right.
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If you are given the arc length of s,\n\nThe angle may be found by\n\ns/(2*PI*r) * 360 degrees.
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Area of a Rectangle\nA rectangle is a good, simple shape to begin with. The area of a rectangle is equal to the product of the length of its base and the length of its height. The height is a segment that is perpendicular to the base. For a rectangle, the base and height are often called the "length" and the "width", and sometimes the height is referred to as the "altitude." \n\nArea of a Parallelogram\nTo find the area of a parallelogram, we can use the same formula that we used for the area of a rectangle, multiplying the length of the base times the length of the height. \n\n\n\nLet's find the area of a parallelogram that has a base of 23 cm and a height of 7 cm. If we substitute the values into the formula, we find that the parallelogram has an area of 161 square centimeters\n\n&...
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1) a triangle and an ext angle by given.\n2) 1+2+3=180 by the sum of interiors of a triangle\n3) 3+4= 180 by linear pair postulate (or theorem, i forgot)\n4) 1+2+3=4+3 by Transitive property\n5) 1+2=4 by Subtraction property.