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Areas of Triangles, Parallelograms, & Trapezoids
Rectangle Area = number of square units contained in the figure. Calculated A = lw l w
Rectangle Sometimes referred to as base and height A = bh b h
Parallelogram Especially, when we are looking at a parallelogram A = bh b h
Parallelogram Height is always PERPENDICULAR to the base A = bh b h
Triangles Now let’s consider triangles b h How would we calculate the Area of the triangle?
Triangles A = ½ bh b h
Triangles No matter what the triangle looks like, A = ½ bh. b h h b h b h b
Triangles Folding the corners over shows that the triangle is ½ the rectangle. h b
Trapezoids A = ½ h ( b 1 + b 2 ) h b1b1 b2b2
Sample problems Identify the shape and use the appropriate formula. 8 cm 12 cm
Sample problems A = lw A = 8 12 8 cm 12 cm 96 cm 2
Sample problems Identify the shape and use the appropriate formula. 15’ 9’
Sample problems A = b h A = 15 9 15’ 9’ 135 ft 2
Sample problems Identify the shape and use the appropriate formula. 14”
Sample problems A = s 2 A = 14 2 196 in 2 14”
Sample problems Identify the shape and use the appropriate formula. 5cm 24 cm
Sample problems A = ½ b h A = ½ 24 5 5cm 24 cm 60 cm 2
Sample problems Identify the shape and use the appropriate formula. 15 m 12 m 6 m
Sample problems A = ½ h (b 1 + b 2 ) A = ½ 6 (12 + 15) 12 m 15 m 6 m 81 m 2
Sample problems Identify the shape and use the appropriate formula. 5 m
Sample problems What is the height? 5 m
Triangles, Quadrilaterals, Nets, Prisms & Composite Polygons
8cm 5cm Area = 8 x 5 = 40cm 2 A parallelogram can be split up into a rectangle and 2 triangles – each with the same area. 10cm 5cm.
10-2 Area of a Triangle 1.) What is the formula for the area of a rectangle? 2.) If a rectangle is divided into two equal triangles, what is the formula.
Areas of Parallelograms. Parallelogram A parallelogram is a quadrilateral where the opposite sides are congruent and parallel. A rectangle is a type of.
Copyright©amberpasillas2010. Perimeter – (P) (P) The distance around a figure. 10 ft. 6 ft ft.
$100 Area of Parallelograms Area of Triangles Perimeter And Area Area of Trapezoids Area of Compound Figures & Area and Circumference of Circles $200.
A tangram is an ancient Chinese puzzle made from a square
Area of Composite Shapes We are learning to…find the area of composite shapes (shapes made up of more than one figure). Tuesday, August 25, 2015.
Section 9-4 Perimeter, Area, and Circumference.
Developing Formulas for Triangles and Quadrilaterals
Bell Work Find the area of each figure. 5 in 9 in 13 in 6 in 16 in 22 in 10 in A = (13 + 9) 5 A = 11 5 A = (22) 5 A = 55 in² A = ( ) 10 A =
Finding the Area of Polygons Vocabulary Perimeter – The sum of all sides of the shape. Area – The total occupied space of a shape in units squared.
Area of Composite Shapes We are learning to…find the area of composite shapes (shapes made up of more than one figure). Monday, September 07, 2015.
Areas of Parallelograms and Triangles
Areas of Parallelograms, Triangles and Trapezoids
Area & Perimeter Perimeter The distance around a shape – The sum of the lengths of all the sides in a shape – Measured in units of length i.e. Feet,
9-4 Area of Triangles and Trapezoids Course 2 Warm Up Warm Up Problem of the Day Problem of the Day Lesson Presentation Lesson Presentation.
Area of Triangles and Trapezoids base altitude base.
Area Formulas Rectangle What is the area formula?
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