Embedded Files
Ämne / Topic
Ämne / Topic
Calculations involving similar shapes.
Inlärningsmål / Learning Goals
Inlärningsmål / Learning Goals
To understand when shapes are similar.
To be able to calculate missing values from similar shapes.
Google Slides & Videos
Google Slides & Videos
Lektionssteg / Steps in the lesson:
Lektionssteg / Steps in the lesson:
- Lektionsuppvärmning / Lesson warm up / Hook / Review from previous lesson
2. Introduktion till lektionen / Introduction to the lesson content
2. Introduktion till lektionen / Introduction to the lesson content
Two figures that have the same shape are said to be similar.
When two figures are similar, the ratios of the lengths of their corresponding sides are equal.
similar
Two polygons are similar if their corresponding sides are proportional.
3. Aktiviteter / Key Activities
3. Aktiviteter / Key Activities
If two objects have the same shape, they are called "similar." When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles shown are similar, compare their corresponding sides. Are these ratios equal?
SF = 6 ÷ 3 = 2
b) Now we have the scale factor, we can apply it to the corresponding length to BE which is BC. Hence, we find that,
AC = 4.4 × 2 = 8.8cm
4. Kolla vad eleverna kan / Check for understanding / Exit ticket
4. Kolla vad eleverna kan / Check for understanding / Exit ticket
Worksheet to be completed in class attached.
5. Stängning / Closure / Summary of lesson
5. Stängning / Closure / Summary of lesson
Review how to determine when shapes are similar.
Review how to determine when shapes are similar.
Resurser & Materiel / Resources & Materials
Resurser & Materiel / Resources & Materials
http://webbapp.liber.se/matematikboken-z/#
http://webbapp.liber.se/matematikboken-z/#/3-geometri
Textbook work:
Ett pg. 115. no. 3019, 3020
Två pg. 116 no. 3023 ab, 3024, 3025
Tre pg. 117 no. 3027 abc, 3028, 3029, 3030
Fyra pg. 118 no. 3032 abc, 3033, 3034, 3035
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