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From Karnataka Open Educational Resources
→Concept #4. Scale drawing
# Since it is not always possible to draw on paper the actual size of real-life objects such as the real size of a car, an airplane, we need scale drawings to represent the size.
# Since it is not always possible to draw on paper the actual size of real-life objects such as the real size of a car, an airplane, we need scale drawings to represent the size.
# Drawing to scale is a tool that Engineers use for many different tasks. One key part of every scale drawing is the scaling factor. This number represents the degree to which our scale drawing or scale model has been reduced in size when compared to the original.
# Drawing to scale is a tool that Engineers use for many different tasks. One key part of every scale drawing is the scaling factor. This number represents the degree to which our scale drawing or scale model has been reduced in size when compared to the original.
===Notes for teachers===
===Notes for teachers===
===Activity No # ===
===Activity No # ===
Graph sheets, scale, pencil,
Graph sheets, scale, pencil,
*Prerequisites/Instructions, if any
*Prerequisites/Instructions, if any
# The students should have knowledge about scale drawing.
# They should know about scale factor.
# They should understand that a scaling factor should be maintaining as constant throughout the sketches.
# Students should be able to read and understand a scaling factor.
# They should be able to find a scaling factor and create a scale drawing.
*Multimedia resources
*Multimedia resources
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
# What are the actual dimensions of each room ?
# What are the actual dimensions of each room ?
*Question Corner:
*Question Corner:
# Estimate the cost of painting each room if painting costs Rs 100 per square foot.
# What all factors do you need to know to estimate the painting costs for each of the rooms.
# How would you go about the calculations.
= Hints for difficult problems =
= Hints for difficult problems =
