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Similar and congruent triangles (view source)
Revision as of 16:03, 28 December 2013
, 16:03, 28 December 2013no edit summary
# recognize and apply “corresponding sides of similar triangles are proportional”.
# recognize and apply “corresponding sides of similar triangles are proportional”.
===Notes for teachers===
===Notes for teachers===
# The teacher can bring different sized photographs got from same negative like stamp size, passport size and a post card size .
# Compare them and say that all photos are look alikes and are proportionate. only the size differs.
# She can also mention about scale concept in graphical representation.
# Hence similar triangles are the same proportionate triangles but of different sizes.
# Two triangles are similar if they have:
* all their angles equal
* corresponding sides in the same ratio
# In similar triangles, the sides facing the equal angles are always in the same ratio. Application of this finds its use in finding the unknown lengths in similar triangles . For this :<br>
Step 1: Find the ratio of corresponding sides in pairs of similar triangles.<br>
Step 2: Use that ratio to find the unknown lengths.<br>
===Activity No # 1. SIMILAR TRIANGLES===
===Activity No # 1. SIMILAR TRIANGLES===
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
# They should know how to find ratio.
# They should know how to find ratio.
# They should know to find area and perimeter of triangles.
# They should know to find area and perimeter of triangles.
*Multimedia resources: Laptop
*Multimedia resources: Laptop
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
*Process:
*Process:
*Developmental Questions:
*Developmental Questions:
# Look at the shape of both triangles being formed? (look alikes )
# Look at the shape of both triangles being formed? (look alikes )
